Eminence 18 Scoop

yep.

I had an oldschool Fane Studio in it, was very deep.
Mind you, the Staip Mk ONE mini with the V1200 was very low, proper sub, but not too controlled

levyte357 wrote:

bitzo wrote: ok internal width 60 cm, depth from baffle 68.8 (72.5 minus 3*woodthickness). I modeled a duct to have the cornered negative expansion on the top right corner brace.

I estimate internal chamber depth to be: 245 - (30+18) = 197mm, is this what you're using to estimate chamber volume ?

Would leave the duct out of sim for now, and just model scoop in 3 segments,

throat to first corner
first corner to start of horn mouth
mouth start to end of horn mouth

Graph should basically say small peak around 43hz, dip 50-65, steeply rising to huge peak at 80hz.

However excursion graph should state minimum excursion at 40hz, which is why small chamber scoops like pre-amps.. smiley23

"throat to first corner
first corner to start of horn mouth
mouth start to end of horn mouth"

throat to first corner (top right)
first corner to start of horn mouth? first top right corner expanding all the way to the mouth
mouth start to end of horn mouth? :think: :crazy:

levyte357 wrote:

nickyburnell wrote: OK thats easy Lev, too wide though.
How much we losing if it's 636 wide?, ie 600 mouth

levyte357 wrote:

bitzo wrote: Prototyping is the definitive way to learn but a bit expensive for just an hobby.

When this cab is built H48", W24", 29"D, with approx 5" gap below rear baffle + corner bracing/deflectors, it gives stunning performance with these drivers and many similiar,

24"W is 610mm wide.. :lol:

25"W (636mm) would be even better.

you wouldn't notice much
..and 22'' wide would get more on a truck

mykey- wrote:
u wouldn't notice much
..and 22'' wide would get more on a truck

22" wide too skimpy... Min 24" wide.. 25" wide nice.

Dont forget most places only need 4x 1850 scoops to cover 400 people Mykey... smiley36

Agreed, skinny scoops look silly

Fasion eh!

from here

levyte357 wrote: I estimate internal chamber depth to be: 245 - (30+18) = 197mm, is this what you're using to estimate chamber volume ?

20 cm

levyte357 wrote: Would leave the duct out of sim for now, and just model scoop in 3 segments,

throat to first corner
first corner to start of horn mouth
mouth start to end of horn mouth
......

I don't get it what do you mean however here's how I model this scoop.
[attachment=0:3fm9cxef]<!-- ia0 -->howemi.jpg<!-- ia0 -->[/attachment:3fm9cxef]
section 12 horn
section 23 horn
section 34 duct,
section 45 horn
section 67 horn
then horn till mouth
in section 34 there's the negative expansion I modeled it like a duct with these dimensions s3*s4/2 in akabak hd={h3} wd={width} len={h4/2}

bitzo wrote: I don't get it what do you mean however here's how I model this scoop.

section 12 horn
section 23 horn
section 34 duct,
section 45 horn
section 67 horn
then horn till mouth
in section 34 there's the negative expansion I modeled it like a duct with these dimensions s3*s4/2 in akabak hd={h3} wd={width} len={h4/2}

Well done.. Please continue... smiley32

may be should be better hd={h4} wd={width} len={h3/2} the volume is the same but the sim is a bit different.
[attachment=0:3l6u18mn]<!-- ia0 -->eminence2.jpg<!-- ia0 -->[/attachment:3l6u18mn]

that's exactly what I drew up a month ago

I wonder if the 12 and 15 draw up the same? if not I was right about it being a typo mistake

mykey- wrote: that's exactly what I drew up a month ago

I wonder if the 12 and 15 draw up the same? if not I was right about it being a typo mistake

The original Eminence illustration is not to scale, so incorrectly depicts panel placement.

Here's scale drawing Saul did last year showing this,

[attachment=0:3pmz2435]<!-- ia0 -->original_emmy_scoop.jpg<!-- ia0 -->[/attachment:3pmz2435]